Twin ellipse pump

ABSTRACT

In the new and improved pump disclosed herein, a pair of counterrotating crossed arms of unequal lengths are respectively rotatably mounted in the center of a pair of semicylindrical overlapping chambers. Rollers on the outer ends of each of the arms are rollingly engaged within a resilient elliptically shaped band disposed around the walls of each chamber and resiliently coengaged with the other band at a point midway between the two chambers to separate a common fluid inlet and outlet. Each pair of the arms has one longer arm with an overall length substantially equal to the diameter of the chambers so that counterrotation of the arms will move the rollers on the longer arms around the bands to press successive portions of the bands against the adjacent cylinder walls for forming progressively advancing fluid displacement spaces around the perimeter of the cylinders to conduct fluids from the inlet to the outlet.

United States Patent [72] Inventor Edwin C. Bragdon 2115 San FelipeRoad, Houston, Tex.

77019 [21] Appl. No. 30,125 [22] Filed Apr. 20, 1970 [45] Patented Dec.21 I971 [54] TWIN ELLIPSE PUMP 3 Claims, 9 Drawing Figs.

Primary Examiner-Carlton R. Croyle Assistant Examiner-Richard E. GluckABSTRACT: In the new and improved pump disclosed herein, a pair ofcounterrotating crossed arms of unequal lengths are respectivelyrotatably mounted in the center of a pair of semicylindrical overlappingchambers. Rollers on the outer ends of each of the arms are rollinglyengaged within a resilient elliptically shaped band disposed around thewalls of each chamber and resiliently coengaged with the other band at apoint midway between the two chambers to separate a common fluid inletand outlet. Each pair of the arms has one longer arm with an overalllength substantially equal to the diameter of the chambers so thatcounterrotation of the arms will move the rollers on the longer armsaround the bands to press successive portions of the bands against theadjacent cylinder walls for forming progressively advancing fluiddisplacement spaces around the perimeter of the cylinders to conductfluids from the inlet to the outlet.

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TWIN ELLIPSE PUMP This invention relates to pumps, and more particularlyto new and improved pumps adapted to deliver a soft even flow withoutcreating pockets and crevices to stagnate materials.

It is therefore the main purpose of this invention to provide a pump forall types of liquids, gas or air.

Other objects of this present invention are to provide a pump which issimple in design, inexpensive to manufacture rugged in construction,easy to use and efficient in operation.

These and other objects will become readily evident upon a study of thefollowing specification and the accompanying drawings wherein:

FIG. 1 is a top view with top and bottom housing plates removed from apreferred embodiment of the present invention;

FIG. 2 is same as FIG. 1 except that portions of the depicted pump havebeen advanced; I

FIG. 3 is a horizontal side view of the pump shown in FIG. 1;

FIG. 4 shows a set of gears used to drive the pump of the presentinvention;

FIG. 5 shows a steel impeller band employed in the present invention;

FIG. 6 depicts a conventional rubber band or tire to fit over the steelband shown in FIG. 5 of the drawings;

FIG. 7 a horizontal side view of the top and bottom housing plates forused for. the pump shown in FIG. 1;

FIGS. 8 and 9 show the rotatable arms and rollers employed for the pumpof the present invention.

According to this invention, a twin ellipse pump 10 is shown in FIGS. 1and 2 to include a hub 23 to which is attached two pairs ofperpendicularly crossed arms which are arranged in two side-by-sidesemicylindrical chambers and have their outer ends respectively attachedto rollers 25 forming an ellipse 21.

The outer housing 11 has bolt holes to secure top and bottom plates 45.

The flow lines 17 and 19 may be reversed with precisely the sameefiiciency.

Looking now at FIG. 3 of the drawing 18 one will see a horizontal viewof FIG. 1, showing shafts 23 top and bottom housing plates 45, topbearing oil boxings 31, gears 33, oil pan 37, bolts 35, bearings 41 andpower pulley 39.

In FIG. 4 in drawings 20 there are two gears 33 and hubs 23.

In FIG. 5 of drawing 22 is a round spring steel band 21 to be sprunginto an ellipse shown in FIG. 1.

FIG. 6 shows a rubber seal band 43 which may be optional to use withband 21 for a seal to eliminate close tolerances.

FIG. 7 shows the top and bottom housing plates 45, bearings 41, boltholes 27, bearing 41, bolt holes 27, bearing housing 31 and outerhousing 1 1.

Now what I claim is:

l. A rotary pump comprising: a housing having an inlet and outlet onopposite sides thereof and having first and second semicylindricalchambers on opposite sides thereof and disposed in an overlappingrelationship; first and second rotors cooperatively arrangedside-by-side for rotation in said first and second chambersrespectively, each of said rotors comprised of a longer armperpendicularly intersected with a shorter arm, and a plurality ofrollers respectively mounted on the outer ends of said arms, the rollerson said longer arms being positioned thereon for rotation in a circularpath substantially adjacent to the walls of their respective chamber andthe rollers on said first shorter arms being positioned thereon forrotation in a circular path of lesser diameter approaching tangentialintersection with the circular path of lesser diameter of said rollerson said second shorter arms; first and second endless resilient bands ofa substantially elliptical configuration respectively arranged aroundsaid rollers of said first and second rotors and adapted for beingprogressively pressed against said chamber walls as said rollers on saidlonger arms are successively rollingly engaged around said bands uponcounter rotation of rotors in their respective chamber portions fortrapping fluids between said chamber walls and said bands andprogressively forcing such trapped fluids from sard inlet to saidoutlet, said first and second bands being engaged with one another atabout the tangential intersection of said circular paths of lesserdiameter for blocking direct fluid communication between said inlet andsaid outlet; and first and second means coupled to said first and secondrotors and adapted for counter rotating said rotors.

2. The rotary pump of claim 1 wherein said first and second bands areformed of metal.

3. The rotary pump of claim I wherein said first and second bands areformed of rubber.

# 4 i l i

1. A rotary pump comprising: a housing having an inlet and outlet onopposite sides thereof and having first and second semicylindricalchambers on opposite sides thereof and disposed in an overlappingrelationship; first and second rotors cooperatively arrangedside-by-side for rotation in said first and second chambersrespectively, each of said rotors comprised of a longer armperpendicularly intersected with a shorter arm, and a plurality ofrollers respectively mounted on the outer ends of said arms, the rollerson said longer arms being positioned thereon for rotation in a circularpath substantially adjacent to the walls of their respective chamber andthe rollers on said first shorter arms being positioned thereon forrotation in a circular path of lesser diameter approaching tangentialintersection with the circular path of lesser diameter of said rollerson said second shorter arms; first and second endless resilient bands ofa substantially elliptical configuration respectively arranged aroundsaid rollers of said first and second rotors and adapted for beingprogressively pressed against said chamber walls as said rollers on saidlonger arms are successively rollingly engaged around said bands uponcounter rotation of rotors in their respective chamber portions fortrapping fluids between said chamber walls and said bands andprogressively forcing such trapped fluids from said inlet to saidoutlet, said first and second bands being engaged with one another atabout the tangential intersection of said circular paths of lesserdiameter for blocking direct fluid communication between said inlet andsaid outlet; and first and second means coupled to said first and secondrotors and adapted for counter rotating said rotors.
 2. The rotary pumpof claim 1 wherein said first and second bands are formed of metal. 3.The rotary pump of claim 1 wherein said first and second bands areformed of rubber.